Toyota Celica Supra Forum banner

1 - 20 of 23 Posts

·
Registered
Joined
·
127 Posts
Discussion Starter #1 (Edited)
What it is:
'83 L-type
6mge with about ~125k on it since early 2000s.
Failed CA smog almost 2 years ago. It has been sitting since.

Current smog Issues:
• High HC at Idle
• High HC at 2500 RPM

at 2500 RPM (EDIT: Added to clarify these numbers are at the 2500 RPM test)
About 6 months ago sniffed at ~450 HC
After repairs below ~330 and then ~230
Needed to pass smog of <130 HC

RPMHC ppmCO%CO2%O2%NO(x) ppm
PASS Sep-15​
977​
100​
0.31​
14.4​
0.3​
PASS Sep-15​
2665​
68​
0.64​
13.9​
0.7​
FAIL Aug-20​
1110​
406​
1.44​
14.6​
-0.1​
N/A
FAIL Aug-20​
2198​
237​
1.32​
14.7​
-0.1​
N/A

Road-ready Issues:
• Leaking PoS Griffin radiator
• Sunroof peeling and leaking

What's been done to pass:
• Replaced Pacesetter headers with stock exhaust manifold; port matched, polished. (local shops getting strict; won't let it pass visual after 20 years...)
• New O2 Sensor
• Replaced Frankenstein'd intake tubing with Raptor Racing intake (not CA legal but may be allowed as the other parts are not available and does not change function)
• Port, polish, and cleaned throttle body
• Oil change
• New spark plugs and wires
• New cap/rotor
• Bi-metal vacuum valve ($95 "oops" when replacing cap&rotor)
• Replaced all vacuum hoses with new silicone hoses

So... What next for Smog?
What should be the next step to pass?
I'm thinking about running Seafoam and seeing if that cleans it up the rest of the way. I also have an '85 D intake manifold I'm going to send off to port, polish, and clean but not sure if that would have any impact on emissions, but if I got the intake manifold off maybe there's something else I can do while in there that may help?
What should idle be at to run cleanest? I remember years ago it used to idle around 600, now my idle sits around 1400.

Radiator:
The original Griffin is leaking like crazy. It lasted a while, but I took it to a radiator repair shop and they said it's not worth repairing as it is junk. The bottom edge is leaking and looks like the manufacturer made it using some type of glue or something as it is yellowish. Said the cooling capacity isn't any better than a stock unit anyhow so better off getting something else. He recommended Mishimoto or Champion, but I haven't seen anything on the forums in my searched saying any will fit. I'm going to call the company tomorrow and see if they recommend anything, but otherwise looks like an MK3 radiator will be best? I have the duel electric SPAL fan kit from Raptor Racing.
 

·
Super Moderator
Joined
·
8,362 Posts
High HC is unburnt fuel or burning oil. A brand new engine should be <10 in my experience.
 
  • Like
Reactions: AJ

·
Premium Member
Joined
·
7,930 Posts
Agree w Aaron newer engine HCs should be easily under 50 PPM...

You didn't mention timing correct stock setting??
AFM modified per Pat Bradens Performance Handbook?? IF you did this mod it may be too rich to pass??

New Coil??
New O2 sensor??
Leaky cold start injector??

What were the NOX #s and CO #s??

The previous smog test did it pass, what were the #s??
 

·
Premium Member
Joined
·
5,935 Posts
Yeah,what AJ said. NEW O2 sensor is a good idea. One wire style.
I bought a bag of (5) 18 mm plugs,too.
I even drilled and tapped a little feed port for it.
 

·
Registered
Joined
·
127 Posts
Discussion Starter #6
Never messed with the timing and haven't done the AFM mod.

Last pass was in 09/2015
I edited the original post to clarify the HC numbers I posted were for the 2500 RPM test. I added the last PASS and the most current FAIL. If I can find the original fail I'll post those.

Thanks guys.
 

·
Premium Member
Joined
·
5,935 Posts
Check timing:
 

·
Registered
Joined
·
127 Posts
Discussion Starter #8
New 02 sensor is now in.

Ordered the 18mm plugs.

Researched new coil. The ACCEL looks like the way to go?
I saw mention of MSDs as well for Fords but lost the part number.

Ordering a Mishimoto MK3 radiator tomorrow as well. From all I've read on here the MK3 radiators seem to fit, just need to fab top tabs and bend bottom tabs.
 

·
Premium Member
Joined
·
5,935 Posts
MSD's require a tach adapter. My old Ford LIKED the MSD 6A!
That Ford coil requires some MODS.
Too tall to fit under the hood of a MK II. In it's stock location.It is NOT a bolt on/plug & play.

Some members have those. I have one that has been cut down to fit as a spare.
 

·
Registered
Joined
·
127 Posts
Discussion Starter #10
Good to know. Thanks. I'll go with the Accel then if its plug n play.
 

·
Premium Member
Joined
·
5,935 Posts
That Accel coil is NOT plug and play!
No,really.
 

·
Premium Member
Joined
·
5,935 Posts
When you are ready to pass SMOG, get the engine REALLY HOT!!!!!
Block the radiator if you have to.
NO A/C. No heater. Add some extra Ethanol,too.
Your engine will burn really clean.
Yes,these are steps to cheap on the SMOG test.
These all work.;)(y)
 
  • Like
Reactions: AJ

·
Premium Member
Joined
·
5,935 Posts
CHEAT!
The Kalifornia boys know these tricks,already.
Visual inspection? They really are tough.
CARB approved? Maybe.
The stock exhaust manifold was a good plan!
Those people may flag the Chimpy intake.

Paint the NEW radiator black with Plasti-coat?
Damn.
My car would never pass as is!:(
 

·
Premium Member
Joined
·
7,930 Posts

·
Super Moderator
Joined
·
8,362 Posts
An ignition coil isn't going to do anything unless you have some kind of misfiring going on. Once you ignite the mixture it's not like you can ignite it any better. Like I said hydrocarbons come from oil and gas passing thru the combustion chamber. So if you'r burning any oil or the engine is running rich they will be high It's interesting that you don't list NOx on there. It would be helpful to know those. If all 3 numbers where high could indicate a failing cat. If you have an IR gun you can measure the in and out temps on the cat to see its working or not. You might be able to just replace the CAT to pass temporarily before it gets trashed again.
 

·
Registered
Joined
·
127 Posts
Discussion Starter #16
Yeah. I'm not sure why they don't have NO(x) listed. It just shows N/A on the newest sniff and it doesn't even have a box or spot listed anywhere on the older test. I will ask them next time I take it in for a sniff to see if they can give me those numbers as well.
I do have an IR gun so I'll check temps once the radiator is here and I can drive it.

• Mishimoto radiator on it's way.
• Ignition coil purchase on hold for now.
• Plasti-coat radiator WTF?!
• Timing gun purchased (waiting on radiator to test).
• CRC purchased.



In the meantime, here are some goodies from the exhaust manifold work.

Pacesetters removed. They're over 20 years old and were wrapped for most of their life. Wish I ceramic coated them back then, but oh well, they lasted.



Exhaust manifold and lower pipe from junkyard.




Returned from SoCal Porting gasket matched, polished, and ceramic coated in and out.






I wish I could find the before picture of the gasket, but there was quite a bit of material removed.



Throttle body they said was already ported which is funny since I "ported it" myself 20+ years ago. I forgot. But they cleaned it a bit.
 
  • Like
Reactions: ddd228

·
Registered
Joined
·
113 Posts
Is your CAT reaching light off temperature before running this smog test?
 

·
Premium Member
Joined
·
5,935 Posts
Would that be 4 to 6 hundred Frankensteins?
 
  • Like
Reactions: AJ

·
Registered
Joined
·
113 Posts
Yep, at the low end.
Just beginning to function at that range.
 
  • Like
Reactions: AJ

·
Registered
Joined
·
127 Posts
Discussion Starter #20
I'm lost. What!? Lol.

And pirate I don't know. Last test I drove about 15 minutes and took it in. But they always let the car sit for a few before testing. I'm going to see with the IR fun next time like silvermk2 said.
 
  • Like
Reactions: ddd228
1 - 20 of 23 Posts
Top